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15 papers · 2 filters
Killing spinor space-times and constant-eigenvalue Killing tensors
D. Beke, N. Van den Bergh, L. Wylleman
A class of Petrov type D Killing spinor space-times is presented, having the peculiar property that their conformal representants can only admit Killing tensors with constant eigen…
Effective approach to the problem of time: general features and examples
Martin Bojowald, Philipp A Hoehn, Artur Tsobanjan
The effective approach to quantum dynamics allows a reformulation of the Dirac quantization procedure for constrained systems in terms of an infinite-dimensional constrained system…
Modified general relativity as a model for quantum gravitational collapse
Andreas Kreienbuehl, Viqar Husain, Sanjeev S. Seahra
We study a class of Hamiltonian deformations of the massless Einstein-Klein-Gordon system in spherical symmetry for which the Dirac constraint algebra closes. The system may be reg…
The Conformal Constraint in Canonical Quantum Gravity
Gerard 't Hooft
Perturbative canonical quantum gravity is considered, when coupled to a renormalizable model for matter fields. It is proposed that the functional integral over the dilaton field s…
Probing the small distance structure of canonical quantum gravity using the conformal group
Gerard 't Hooft
In canonical quantum gravity, the formal functional integral includes an integration over the local conformal factor, and we propose to perform the functional integral over this fa…
An effective approach to the problem of time
Martin Bojowald, Philipp A Hoehn, Artur Tsobanjan
A practical way to deal with the problem of time in quantum cosmology and quantum gravity is proposed. The main tool is effective equations, which mainly restrict explicit consider…